CN213546387U

CN213546387U - Lithium ion battery, battery module and car

Info

Publication number: CN213546387U
Application number: CN202022751824.6U
Authority: CN
Inventors: 张五堂; 刘阳; 郭亚飞
Original assignee: Shanghai Lanjun New Energy Technology Co Ltd
Current assignee: Shanghai Lanjun New Energy Technology Co Ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-06-25
Anticipated expiration: 2030-11-24

Abstract

The embodiment of the utility model provides a lithium ion battery, battery module and car relates to the battery field. The lithium ion battery comprises a battery shell, a positive pole post, a negative pole post and a test assembly; the positive pole column and the negative pole column are arranged on the outer side of the battery shell, and electrolyte is contained in the battery shell; the test assembly comprises a test inner core, an electrolysis protective shell and a connecting conductor, the electrolysis protective shell is coated on the outer side of the test inner core, the test inner core and the electrolysis protective shell are both located in a battery shell and are used for being in contact with electrolyte in the battery shell, one end of the connecting conductor is connected with the test inner core and/or the electrolysis protective shell, and the other end of the connecting conductor penetrates through and extends out of the battery shell. The embodiment of the utility model provides a can improve the degree of accuracy of battery aassessment.

Description

Lithium ion battery, battery module and car

Technical Field

The utility model relates to a battery field particularly, relates to a lithium ion battery, battery module and car.

Background

In the field of batteries, a test electrode made of pure lithium or plated lithium is placed inside the battery to test the content of lithium inside the battery through a third electrode. The structure adopted by the third pole in the battery at present has two types, namely graphite lithium-embedded structure and metal lithium-plated structure. The graphite lithium intercalation is easy to dissolve by the electrolyte, and the error of the measured value along with the lapse of time is large; the lithium plating metal has a loose structure, and the voltage is unstable, so that the measurement is not accurate. That is, in the prior art, the third electrode test has the problems of low accuracy and large deviation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a lithium ion battery, battery module and car, its degree of accuracy that can improve the battery aassessment.

The embodiment of the utility model is realized like this:

in a first aspect, the present invention provides a lithium ion battery, which includes a battery case, a positive electrode post, a negative electrode post and a testing assembly;

the positive pole column and the negative pole column are arranged on the outer side of the battery shell, and electrolyte is contained in the battery shell;

the test assembly comprises a test inner core, an electrolysis protective shell and a connecting conductor, wherein the electrolysis protective shell is coated on the outer side of the test inner core, the test inner core and the electrolysis protective shell are both positioned in the battery shell and are used for being in contact with electrolyte in the battery shell, one end of the connecting conductor is connected with the test inner core and/or the electrolysis protective shell, and the other end of the connecting conductor penetrates through and extends out of the battery shell.

In an alternative embodiment, the electrolytic protective shell is encapsulated outside the test core.

In an alternative embodiment, the test core is lithium metal, the material of the electrolytic protective shell is lithium lanthanum zirconium oxygen, and the connection conductor is copper metal.

In an optional embodiment, one end of the connection conductor extending out of the battery case is a test electrode, and the test electrode is disposed close to the negative electrode post.

In an optional embodiment, the test electrode is located between the positive electrode post and the negative electrode post, or the negative electrode post is located between the positive electrode post and the test electrode.

In an optional embodiment, the number of the test assemblies is multiple, and the test inner cores of the multiple test assemblies and the electrolysis protection shells corresponding to the test inner cores are arranged at intervals.

In an alternative embodiment, the test electrodes in a plurality of the test assemblies are provided in one piece.

In a second aspect, the present invention provides a method for testing a third electrode of a lithium ion battery, using the lithium ion battery according to any of the previous embodiments, the method comprising:

measuring a voltage value between the cathode pole and the connecting conductor extending out of the battery shell;

and judging the battery capacity of the lithium ion battery according to the voltage value.

In a third aspect, the present invention provides a battery module comprising at least one lithium ion battery according to any of the previous embodiments.

In a fourth aspect, the present invention provides an automobile, comprising the battery module according to the foregoing embodiments.

The embodiment of the utility model provides a lithium ion battery, battery module and car: this lithium ion battery sets up the test subassembly in the battery case, and the outer cladding of test inner core electrolysis protective housing to outside drawing forth to the battery case through connecting conductor, this electrolysis protective housing has electric conductivity, and when the cladding of electrolysis protective housing is in the test inner core outside, the test inner core is connected and switches on with the electrolysis protective housing, and connecting conductor and test electric core and at least one lug connection in the electrolysis protective housing can make connecting conductor and test inner core and electrolysis protective housing switch on. When testing the potential difference between the third electrode and the negative electrode, the potential difference between the part of the connecting conductor extending out of the battery shell and the negative electrode pole can be tested, so that the test is simple and convenient. The embodiment of the utility model provides an in, through the outside cladding electrolysis protective housing at the test inner core, can reduce or avoid the solution to the dissolution of test inner core to guarantee that the measured value can not dissolve and produce great error because of time lapse and test inner core. That is in the embodiment of the utility model provides an in, the measuring result degree of accuracy of third pole is high, is favorable to improving the accuracy and the reliability that the battery was evaluateed to the inside residual value of accurate aassessment battery. Correspondingly, the battery module and the automobile at least have the beneficial effects.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a lithium ion battery provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a test assembly according to an embodiment of the present invention.

Icon: 100-a lithium ion battery; 110-a battery case; 120-positive pole column; 130-negative pole post; 140-a test component; 141-testing the inner core; 142-an electrolytic protective shell; 143-connecting conductors; 144-test electrodes.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, an embodiment of the present invention provides a lithium ion battery 100. The lithium ion battery 100 can improve the accuracy of battery evaluation, thereby facilitating accurate evaluation of the remaining value inside the battery.

It is noted that the lithium ion battery 100 can be used in automobiles or other electromechanical devices, including but not limited to new energy automobiles. The embodiment of the utility model provides a do not specifically limit to this lithium ion battery 100's range of application.

In the embodiment of the present invention, the lithium ion battery 100 includes a battery housing 110, a positive electrode post 120, a negative electrode post 130, and a test assembly 140. The positive electrode post 120 and the negative electrode post 130 are both disposed outside the battery case 110, and the battery case 110 is used for accommodating an electrolyte.

It can be understood that the positive electrode post 120 and the negative electrode post 130 are disposed on the battery housing 110 at intervals, and the embodiment of the present invention does not require the specific structural form and the arrangement manner of the positive electrode post 120 and the negative electrode post 130. The positive electrode post 120 and the negative electrode post 130 may be located on the same side of the battery case 110, or may be located on different sides of the battery case 110; when the positive electrode post 120 and the negative electrode post 130 are located on different sides of the battery case 110, the side where the positive electrode post 120 is located and the side where the negative electrode post 130 is located may be adjacent to each other or opposite to each other.

In addition, the shapes of the positive electrode post 120 and the negative electrode post 130 are not required, and the positive electrode post and the negative electrode post can be cylinders, cuboids and the like; also, the shape of the positive electrode post 120 and the shape and size of the negative electrode post 130 may be the same or different.

It should be understood that the lithium ion battery 100 may also include other components, such as explosion-proof valves, charge ports, sealing pins, etc. The embodiments of the present invention will be described in detail only for the components related to the improvement points, and descriptions of other components will be omitted.

Referring to fig. 2, the testing assembly 140 includes a testing core 141, an electrolytic protection shell 142 and a connecting conductor 143, the electrolytic protection shell 142 covers the testing core 141, the testing core 141 and the electrolytic protection shell 142 are both located in the battery case 110 and are used for contacting with the electrolyte in the battery case 110, one end of the connecting conductor 143 is connected to the testing core 141 and/or the electrolytic protection shell 142, and the other end of the connecting conductor penetrates through and extends out of the battery case 110 to form a third electrode or a testing electrode 144 of the lithium ion battery 100.

It should be noted that, in the embodiment of the present invention, the testing assembly 140 includes a testing inner core 141, the outer side of the testing inner core 141 is covered with a layer of electrolytic protection shell 142, and then the testing inner core 141 is connected through the connecting conductor 143, so that it is led out of the battery case 110, thereby facilitating the testing.

The connection conductor 143 may be directly connected with at least one of the test cell and the electrolytic protective case 142. It should be understood that the electrolytic protection shell 142 has conductivity, when the electrolytic protection shell 142 is covered outside the test core 141, the test core 141 is connected and conducted with the electrolytic protection shell 142, and the connection conductor 143 is directly connected with at least one of the test cell and the electrolytic protection shell 142, so that the connection conductor 143 can be conducted with the test core 141 and the electrolytic protection shell 142. When testing the potential difference between the third electrode and the negative electrode, the potential difference between the portion of the connecting conductor 143 extending out of the battery case 110 and the negative electrode post 130 can be tested, so that the test is simple and convenient.

In the embodiment of the present invention, the electrolysis protection shell 142 is wrapped outside the test inner core 141, so that the test inner core 141 is isolated from the external electrolyte, thereby effectively preventing the electrolyte from dissolving the test inner core 141, or increasing the effective service life of the test inner core 141. The electrolytic protection shell 142 can slow down or prevent the test inner core 141 from being dissolved by the electrolyte, so that a test result cannot generate large errors along with the time, and the test accuracy is ensured; meanwhile, the accurate test result is convenient for accurately evaluating the residual value in the battery.

Alternatively, the electrolytic protective shell 142 may be packaged outside the test core 141. In the prior art, the lithium metal plating has a loose structure, so that the voltage is unstable, and thus the measurement is inaccurate. In the embodiment of the present invention, the electrolytic protection shell 142 is covered (or packaged) outside the testing inner core 141, so that the structure is compact, the testing voltage is more stable, and the testing is more accurate.

Alternatively, the test core 141 is metallic lithium, for example, pure lithium is used for the test core 141; the shape of test core 141 includes, but is not limited to: block, strip, disc, etc.

Optionally, the material of the electrolytic protection shell 142 is lithium lanthanum zirconium oxygen, which is an alloy material with good conductivity, and the lithium lanthanum zirconium oxygen immersed in the electrolyte is not easily dissolved, so that it can be ensured that the measurement result does not generate additional deviation with the passage of time; that is, lithium lanthanum zirconium oxygen is not easily dissolved in the electrolyte and the measured value of the third electrode is not.

It should be noted that in the prior art measurement method of graphite intercalation, the graphite intercalation test structure is easily dissolved by the electrolyte, so that the measurement value has large error with the time. And in the embodiment of the present invention, the electrolytic protection shell 142 made of the lithium lanthanum zirconium oxide is coated outside the test core 141, so that the dissolution of the electrolyte to the test core 141 can be reduced or avoided, and the measured value is ensured not to generate a large error due to the time lapse and the dissolution of the test core 141. That is in the embodiment of the utility model provides an in, the measuring result degree of accuracy of third pole is high, is favorable to improving the accuracy and the reliability that the battery was evaluateed to the inside residual value of accurate aassessment battery.

Alternatively, the connecting conductor 143 is made of copper, for example, the connecting conductor 143 is made of a pure copper lead. The lead structure can reduce the space occupied by the connecting conductor 143, thereby improving the overall space utilization. Of course, the present invention is not limited thereto, and the connecting conductor 143 may be made of other metal materials; alternatively, when the connection conductor 143 is made of copper, other structures may be adopted, such as a strip of pure copper.

In an alternative embodiment, the end of the connection conductor 143 that extends out of the battery housing 110 is a test electrode 144, and the test electrode 144 is disposed proximate to the negative terminal post 130. As shown, the positive electrode post 120 and the negative electrode post 130 are located on the same side of the battery housing 110, and of course, in other embodiments of the present invention, the positive electrode post 120 and the negative electrode post 130 may also be located on different sides.

Optionally, the test electrode 144 is located between the positive electrode post 120 and the negative electrode post 130, or the negative electrode post 130 is located between the positive electrode post 120 and the test electrode 144. The solution shown in the figure is that the cathode terminal 130 is located between the anode terminal 120 and the test electrode 144, so that the anode terminal 120 and the cathode terminal 130 can be more conveniently connected with an external structure, i.e. the test electrode 144 does not interfere with the connection of the anode terminal 120 and the cathode terminal 130.

In an alternative embodiment, the number of the test assemblies 140 is multiple, and the test cores 141 of the multiple test assemblies 140 and the electrolytic protection shells 142 corresponding to the test cores 141 are disposed at intervals. During testing, the test results of each test assembly 140 may be tested separately, and then the test results may be averaged to average the possible extreme results, thereby ensuring the reliability and accuracy of the results.

Optionally, the test electrodes 144 in the plurality of test assemblies 140 are provided as a single body. I.e., there may be only one test electrode 144 on the outer side of the battery case 110, thereby making the overall structure simpler.

The utility model provides a lithium ion battery 100's third electrode test method utilizes lithium ion battery 100 as any one of the preceding embodiment, and the third electrode test method includes:

step S100: measuring a voltage value between the cathode post 130 and the connection conductor 143 protruding out of the battery case 110; i.e., the voltage value between the test electrode 144 and the negative terminal post 130.

Step S200: the battery capacity of the lithium ion battery 100 is judged according to the voltage value.

In step S200, the battery capacity of the lithium ion battery 100 may be determined according to the measured voltage value: if the voltage value is equal to or less than zero (zero or negative), it indicates that lithium is precipitated, which may cause the battery to ignite; if the voltage value is greater than zero (positive value) and the voltage value is gradually decaying, the battery capacity is reduced, and the battery life is shortened. The embodiment of the utility model provides an in, owing to adopted foretell lithium ion battery 100, the precision of the test result of voltage is higher, more reliable to can carry out more accurate aassessment to lithium ion battery 100, convenience of customers carries out more effective decision-making.

The utility model provides a battery module, including at least one lithium ion battery 100 as in any one of the preceding embodiments.

The utility model provides an automobile, including like the battery module of aforementioned embodiment, this automobile can be new energy automobile, perhaps other cars that can utilize electric energy.

Referring to fig. 1 and fig. 2, a lithium ion battery 100, a third electrode testing method thereof, a battery module, and an automobile according to an embodiment of the present invention are shown: the lithium ion battery 100 is provided with a test assembly 140 in a battery shell 110, an electrolysis protection shell 142 is wrapped outside a test inner core 141 and led out of the battery shell 110 through a connecting conductor 143, the electrolysis protection shell 142 has conductivity, when the electrolysis protection shell 142 is wrapped outside the test inner core 141, the test inner core 141 is connected with the electrolysis protection shell 142 and conducted, the connecting conductor 143 is directly connected with at least one of a test electric core and the electrolysis protection shell 142, and the connecting conductor 143 can be conducted with the test inner core 141 and the electrolysis protection shell 142. When testing the potential difference between the third electrode and the negative electrode, the potential difference between the portion of the connecting conductor 143 extending out of the battery case 110 and the negative electrode post 130 can be tested, so that the test is simple and convenient. In the embodiment of the present invention, the electrolyte can be reduced or prevented from dissolving the test inner core 141 by coating the electrolysis protection shell 142 outside the test inner core 141, so as to ensure that the measured value will not generate a large error due to the time lapse and the dissolution of the test inner core 141. That is in the embodiment of the utility model provides an in, the measuring result degree of accuracy of third pole is high, is favorable to improving the accuracy and the reliability that the battery was evaluateed to the inside residual value of accurate aassessment battery.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The lithium ion battery is characterized by comprising a battery shell (110), a positive electrode pole (120), a negative electrode pole (130) and a test component (140);

the positive electrode pole (120) and the negative electrode pole (130) are both arranged on the outer side of the battery shell (110), and electrolyte is contained in the battery shell (110);

the testing assembly (140) comprises a testing inner core (141), an electrolysis protection shell (142) and a connecting conductor (143), wherein the electrolysis protection shell (142) is wrapped outside the testing inner core (141), the testing inner core (141) and the electrolysis protection shell (142) are both positioned in the battery shell (110) and are used for being in contact with electrolyte in the battery shell (110), one end of the connecting conductor (143) is connected with the testing inner core (141) and/or the electrolysis protection shell (142), and the other end of the connecting conductor penetrates through and extends out of the battery shell (110).

2. The lithium ion battery of claim 1, wherein the electrolytic protective shell (142) is encapsulated outside the test inner core (141).

3. The lithium ion battery according to claim 1, wherein the test inner core (141) is metallic lithium, the material of the electrolytic protective shell (142) is lithium lanthanum zirconium oxygen, and the connection conductor (143) is metallic copper.

4. The lithium ion battery according to claim 1, wherein the end of the connecting conductor (143) extending out of the battery case (110) is a test electrode (144), and the test electrode (144) is disposed close to the negative electrode post (130).

5. The lithium ion battery according to claim 4, characterized in that the test electrode (144) is located between the positive electrode post (120) and the negative electrode post (130), or the negative electrode post (130) is located between the positive electrode post (120) and the test electrode (144).

6. The lithium ion battery according to claim 4 or 5, characterized in that the number of the test assemblies (140) is multiple, and the test cores (141) of the multiple test assemblies (140) and the corresponding electrolytic protective shells (142) of the test cores (141) are arranged at intervals.

7. The lithium ion battery of claim 6, wherein the test electrodes (144) in a plurality of the test assemblies (140) are provided as a single body.

8. A battery module, characterized in that it comprises at least one lithium ion battery (100) according to any of claims 1 to 7.

9. An automobile characterized by comprising the battery module according to claim 8.